Re: big endian toolchains

[Philip Blundell <philb at gnu dot org>]

Does this do the trick for you?  Use a target name of `armeb-linux' when you 
configure.

(gcc-patches folk: I'd like to apply this to the mainline, assuming I can 
still bootstrap a little-endian configuration.)

p.

2001-05-26  Philip Blundell  <philb@gnu.org>

	* config/arm/arm.h (CPP_ENDIAN_DEFAULT_SPEC): Only define if not
	already defined.
	* config/arm/elf.h (ASM_ENDIAN_SPEC): Provide default definition.
	(ASM_SPEC): Replace explicit -EB with %(asm_endian_spec).
	(SUBTARGET_EXTRA_SPECS): Add asm_endian_spec.
	* config/arm/linux-elf.h (TARGET_DEFAULT): Include
	DEFAULT_ENDIAN_FLAG.
	(MULTILIB_DEFAULTS): Replace "mlittle-endian" with
	MULTILIB_ENDIAN.
	(SUBTARGET_EXTRA_LINK_SPEC): Delete.
	(LINK_SPEC): Replace SUBTARGET_EXTRA_LINK_SPEC with "-m
	armelf_linux -p".  Replace "-EB" with %(link_endian_spec).
	(SUBTARGET_EXTRA_SPECS): Define.
	* config/arm/linux-le.h, config/arm/linux-be.h: New files.
	* config.gcc (arm*-*-linux*): Use them as appropriate.  Only set
	thread_file if $enable_threads is "yes".

Index: config.gcc
===================================================================
RCS file: /cvs/gcc/gcc/gcc/config.gcc,v
retrieving revision 1.63
diff -u -p -u -r1.63 config.gcc
--- config.gcc	2001/05/25 23:08:55	1.63
+++ config.gcc	2001/05/26 13:51:32
@@ -571,13 +571,21 @@ arm*-*-netbsd*)
 	use_collect2=yes
 	;;
 arm*-*-linux*)			# ARM GNU/Linux with ELF
+	case $machine in
+	arm*b-*-linux*)
+		tm_file=arm/linux-be.h
+		;;
+	*)
+		tm_file=arm/linux-le.h
+		;;
+	esac
 	xmake_file=x-linux
-	tm_file="arm/linux-elf.h"
+	tm_file="$tm_file arm/linux-elf.h"
 	tmake_file="t-slibgcc-elf-ver t-linux arm/t-linux"
 	extra_parts="crtbegin.o crtbeginS.o crtend.o crtendS.o"
 	gnu_ld=yes
 	case x${enable_threads} in
-	x | xyes | xpthreads | xposix)
+	xyes)
 		thread_file='posix'
 		;;
 	esac
Index: config/arm/arm.h
===================================================================
RCS file: /cvs/gcc/gcc/gcc/config/arm/arm.h,v
retrieving revision 1.104
diff -u -p -u -r1.104 arm.h
--- arm.h	2001/05/26 01:31:37	1.104
+++ arm.h	2001/05/26 13:51:35
@@ -243,7 +243,9 @@ Unrecognized value in TARGET_CPU_DEFAULT
 "
 
 /* Default is little endian.  */
+#ifndef CPP_ENDIAN_DEFAULT_SPEC
 #define CPP_ENDIAN_DEFAULT_SPEC "-D__ARMEL__ %{mthumb:-D__THUMBEL__}"
+#endif
 
 /* Add a define for interworking.  Needed when building libgcc.a.  
    This must define __THUMB_INTERWORK__ to the pre-processor if
Index: config/arm/elf.h
===================================================================
RCS file: /cvs/gcc/gcc/gcc/config/arm/elf.h,v
retrieving revision 1.26
diff -u -p -u -r1.26 elf.h
--- elf.h	2001/05/04 16:16:43	1.26
+++ elf.h	2001/05/26 13:51:36
@@ -40,21 +40,26 @@ Boston, MA 02111-1307, USA.  */
 #ifndef SUBTARGET_EXTRA_SPECS
 #define SUBTARGET_EXTRA_SPECS \
   { "subtarget_extra_asm_spec",	SUBTARGET_EXTRA_ASM_SPEC },
+  { "asm_endian_spec",		ASM_ENDIAN_SPEC },
 #endif
 
 #ifndef SUBTARGET_EXTRA_ASM_SPEC
 #define SUBTARGET_EXTRA_ASM_SPEC ""
 #endif
 
+#ifndef ASM_ENDIAN_SPEC
+#define ASM_ENDIAN_SPEC "%{mbig-endian:-EB}"
+#endif
+
 #ifndef ASM_SPEC
 #define ASM_SPEC "\
-%{mbig-endian:-EB} \
 %{mcpu=*:-m%*} \
 %{march=*:-m%*} \
 %{mapcs-*:-mapcs-%*} \
 %{mapcs-float:-mfloat} \
 %{msoft-float:-mno-fpu} \
 %{mthumb-interwork:-mthumb-interwork} \
+%(asm_endian_spec) \
 %(subtarget_extra_asm_spec)"
 #endif
 
Index: config/arm/linux-elf.h
===================================================================
RCS file: /cvs/gcc/gcc/gcc/config/arm/linux-elf.h,v
retrieving revision 1.25
diff -u -p -u -r1.25 linux-elf.h
--- linux-elf.h	2001/04/16 18:30:36	1.25
+++ linux-elf.h	2001/05/26 13:51:36
@@ -27,10 +27,9 @@ Boston, MA 02111-1307, USA.  */
 #define NO_IMPLICIT_EXTERN_C
 
 /* Default is to use APCS-32 mode.  */
-#define TARGET_DEFAULT (ARM_FLAG_APCS_32 | ARM_FLAG_MMU_TRAPS)
-#define SUBTARGET_EXTRA_LINK_SPEC " -m armelf_linux -p"
+#define TARGET_DEFAULT (DEFAULT_ENDIAN_FLAG | ARM_FLAG_APCS_32 | ARM_FLAG_MMU_TRAPS)
 #define MULTILIB_DEFAULTS \
-	{ "marm", "mlittle-endian", "mhard-float", "mapcs-32", "mno-thumb-interwork" }
+	{ "marm", MULTILIB_ENDIAN, "mhard-float", "mapcs-32", "mno-thumb-interwork" }
 #define CPP_APCS_PC_DEFAULT_SPEC "-D__APCS_32__"
 
 /* This was defined in linux.h.  Define it here also. */
@@ -46,7 +45,6 @@ Boston, MA 02111-1307, USA.  */
    %{!shared: %{pthread:-lpthread} \
    %{profile:-lc_p} %{!profile: -lc}}"
 
-
 #define LIBGCC_SPEC "%{msoft-float:-lfloat} -lgcc"
 
 /* Provide a STARTFILE_SPEC appropriate for GNU/Linux.  Here we add
@@ -77,9 +75,12 @@ Boston, MA 02111-1307, USA.  */
    %{symbolic:-Bsymbolic} \
    %{rdynamic:-export-dynamic} \
    %{!dynamic-linker:-dynamic-linker /lib/ld-linux.so.2} \
-   -X \
-   %{mbig-endian:-EB}" \
-   SUBTARGET_EXTRA_LINK_SPEC
+   -X -m armelf_linux -p \
+   %(link_endian_spec)"
+
+#define SUBTARGET_EXTRA_SPECS \
+   { "link_endian_spec", LINK_ENDIAN_SPEC }, \
+   { "asm_endian_spec", ASM_ENDIAN_SPEC },
 
 #undef  CPP_PREDEFINES
 #define CPP_PREDEFINES \
--- /dev/null	Tue Apr 10 10:26:39 2001
+++ config/arm/linux-le.h	Sat May 26 10:43:59 2001
@@ -0,0 +1,4 @@
+#define DEFAULT_ENDIAN_FLAG	0
+#define MULTILIB_ENDIAN		"mlittle-endian"
+#define LINK_ENDIAN_SPEC	"%{mbig-endian:-EB} %{!mbig-endian:-EL}"
+#define ASM_ENDIAN_SPEC		"%{mbig-endian:-EB} %{!mbig-endian:-EL}"
--- /dev/null	Tue Apr 10 10:26:39 2001
+++ config/arm/linux-be.h	Sat May 26 10:44:30 2001
@@ -0,0 +1,5 @@
+#define DEFAULT_ENDIAN_FLAG	ARM_FLAG_BIG_END
+#define MULTILIB_ENDIAN		"mbig-endian"
+#define LINK_ENDIAN_SPEC	"%{mlittle-endian:-EL} %{!mlittle-endian:-EB}"
+#define ASM_ENDIAN_SPEC 	"%{mlittle-endian:-EL} %{!mlittle-endian:-EB}"
+#define CPP_ENDIAN_DEFAULT_SPEC "-D__ARMEB__ %{mthumb:-D__THUMBEB__}"